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Schwethelm began his professional career in 2005 with German side Köln 99ers (then called RheinEnergie Köln). He played sparingly for two seasons before seeing significant action starting with the 2007-08 season.[2] While with the 99ers, he participated in EuroCup 2005–06, Euroleague 2006–07, and ULEB Cup 2007–08.

In 2009, the 99ers declared bankruptcy. Schwethelm was then linked to a two-year deal with fellow Bundesliga side Eisbären Bremerhaven.[3] In the 2009–10 season, he averaged a career-high seven points per game in helping the team to the league semifinals.[4]